runge-kutta法，crank_nicolson法，adams法数值积分-runge-kutta method, crank_nicolson law, adams numerical integration method

辛普森积分法(Simpson Integration)是一类常用且有效的数值积分法中，这里提供一个使用VBA实现的辛普森积分法-Simpson integration method (Simpson Integration) is a type of numerical integration commonly used and effective method, used here to provide an implementation of the Simpson integration

提供了6种数值积分方法的c++代码实现： 1 梯形求积法(TRAPZD->QTRAP)； 2 辛普森(Simpson()